384 bits for the GeForce 4090

384bit is the memory bus width. AMD’s Fiji (r9 290x) had a 512-bit bus in 2013. Not to be confused with data types used for calculations.

You compare only on A1111 or only on SHARK

That’s seems like an arbitrary handicap. You should use whichever solution runs best on the respective hardware.

7900xtx matches 4090 in Stable Diffusion as well. And I think it’s also quite competitive in LLMs. Since LLMs are memory capacity and bandwidth bound, and 7900xtx and 4090 are close there.

https://www.pugetsystems.com/labs/articles/stable-diffusion-performance-nvidia-geforce-vs-amd-radeon/

Can AMD ever catch up to the lead NVIDIA has in AI.

Yes. mi300.

How dare anyone be positive about the fastest HEDT CPU on the market.